Locking device for presure pads of double-acting power presses



M. B ALCKER. LOCKING DEVICE FOR PRESSURE PADS 0F DOUBLE ACTING POWER PRESSES.

APPLICATION FILED JAN.26. 192i.

Patented Mar. 14, 1922.

4 SHEETS-SHEET 1.

a Veda/aw M. BALCKER.

LOCKING DEVICE FOR PRESSURE PADS 0F DOUBLE ACTING POWER PRESSES.

APPLICATION FILED JAN-26.192!- I m mm ,n d: 4H 1H TT N M M4. .n... n a m 4 P M. BALCKER.

LOCKING DEVICE FOR PRESSURE PADS 0F DOUBLE ACTING POWER PRESSES.

APPLICATION FILED JAN. 26. I921.

Patented Mar. 14, 1922.

4 SHEETS-SHEET 3.

.- Jig-5 M. BALCKER.

LOCKING DEVICE FORPRESSURE PADS or oousua ACTING POWER PRESSES. APPLICATION FILED JAN. 26. I921.

1 ,409,149, Patented Mar. 14, 1922.

4 SHEETS-SHEET 4.

flq

UNITED STATES PATENT OFFICE.

MARTIN BALGKER, OF CHICAGO, ILLINOIS, ASSIGNOR 'I'O MARQUETTE TOOL &: MANU- FACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LOOKING DEVICE FOR PRESURE PADS 0F DOUBLE-ACTING POWER PRESSES.

T 0 all whom it may concern:

Be it known that I. MARTIN BALCKER, a citizen of the United States, residing at Chicago, in the county of (look and State of Illinois, have invented certain new and useful Improvements in Locking Devices for Pressure Pads of Doul)leActing Power Presses, of which the following is a specification. I

This invention relates to improvements in looking devices particularly adapted though not necessarily limited in its use, for looking the pressure pad orbeam of a double acting power press, equipped with fluid controlled die cushions, and has for one of its objects to provide an improved means for automatically locking together the blank holder or gripping ringsand the pressure pad or beam whereby they will be caused to rise together, and improved means for automatically unlocking them so that the draw or gripping ring cage or support may be lowered independently of the pressure pad or beam.

To the attainment of these ends and the accomplishment of other new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several parts hereinafter more fully described and claimed and shown in the accompanying drawings illustrating this invention and in which- Figure 1 is a view partly in elevatlon, partly in section and with parts omltted of a portion of a double acting die press havthis improvement applied thereto and showingthemechanism in the positions whlch they will assume before the press has started its operation and with the pressure pador beam in its elevated position.

1 Figure 2 is a view similar to F1gure 1 showing the parts in the positions they w1ll assume ust at the completion of the forming operation.

Figure 3 is a detail sectional view taken on line- 33, Figure 2. Figure 4 is a detail end elevation of a portion of the press.

Figure 5 is a view in detail as taken on line 5-5, Figure 7.

Figure 6 is a detail sectional view taken on'line 66, Figure 8.

Figure 7 is an enlarged detail view partly in elevation and partly in section of the Specification of Letters Patent. Patented M 14 1922 Application filed January 26, 1921.

Serial No. 440,049.

locking mechanism with the parts in the position shown in Figure 2. I

Figure 8 is a view similar to Figure 7 with the parts in the position they will assume as shown in Figure 1.

Referring more particularly to the drawings the numeral 10, designates generally the die supporting base or bolster upon which is arranged the die 11, having a movable portion 12. Projecting above the bolster 10, are the usual uprights 13, upon which the draw ring cage 14, is adapted to be reciprocated in the ordinary and well known manner. The draw ring 15, is carried by the cage 14, and is adapted to co-operate with the portion 11, of the die for holding the material 16, in position, in a manner well known in this art. The punch 17, is adapted to be reciprocated in the ordinary and well known manner within the draw or gripping ring 15, independently with respect to the movement of the draw ring.

Arranged beneath the bolster 10, is a cushion beam or element 18, and in the form of the invention herein shown there is connected with this-cushion beam or element a plurality of piston rods 19, connected with piston members (not shown) reciprocable within the cylinders 20. These cylinders 20, are supported in any suitable manner such as by means of the supports 21, and fluid is adapted to be delivered into the cushions from any suitable source of supply, by means of suitable pipe connections 22, so that a fluid pressure will operate u on the cushion beam or element 18. assing through suitable guides, such as a portion of the bed or bolster 10, are pins 23, which engage the movable element 12, of the die or forming means and also engage and rest upon the cushion 'or ressure beam 18, so that when the fluid is admitted into the cylinders 20, on one side of the pistons it will operate the pistons to raise the beam or element 18, and through the medium of the pins 23, raise the element 12, of the forming die, and when pressure is exerted upon the material 16, by the punch 17, the element 12, will be lowered against the pressure of the fluid in the cylinders 20, through the medium of the pins 23, all as well known in this art.

In shaping articles with presses of this character it is desirable to hold the work or article by the gripping or draw ring ,15,

portion 11, of the die,

co-operating with the 17, to be withdrawn means hereinafter described has been pro-- vided and as has been before stated this automatic locking means operates to lock together the-blank holder or gripping rmg 15, and the pressure beam or element 18,

' end of the cushion beam or element 18, an-

through the top 30, and bottom 31, of the so that they will be caused to rise together after the punch has been withdrawn and also to automatically unlock the draw or gripping ring cage 14, and the cushion beam or element 18, so that the draw or gripping ring cage 14, and draw or gripping ring 15, may be lowered independently with respect to the cushion beam or element 18.

To that end there is provided on each automatically operating locking means and as the construction of the locking means and its connection with the draw ring cage on each end of the beam or element 18, is the same, the description of one will apply equally as well to both of them.

Arranged within the end of the beam or element 18,.is a housing 24, having a cam 25, therein and which cam is mounted for pivotal movement upon a shaft 26, preferably passing through the cam and through the walls of the housing. This cam is provided on a portion thereof with a series of teeth or projections 27, adapted to engage and mesh with a series of teeth 28, carried by an element 29, which latter passes loosely through the top 30, and bottom 31, of the housing 24. Connected with the draw ring cage 14, is a bar or rod 32, which is of any desired length,

the lower extremity 33, thereof being preferably rectangular in cross section and of any suitable hardened material. This section 33, is adapted to'be connected with the bar or rod 32, in any suitable manner such as by means of a tongue or'projection 34. The extremity 33, of the bar or rod passes loosely housing 24, similar to the element 29, but on the side of the cam adjacent the active edge- 35, of the cam so that when the cam is moved about its pivot by means of the shifting of the element 29, the active surface thereof will be brought into frictional contact with the face of the extremity 33, of the bar orrod for frictionally locking together the draw ring cage 14, and the, cushion beam or element 18.

The element 29, projects forany desired distance above the beam or element 18, and is provided with a shoulder 36, preferably adjacent one end thereof. A housing 37, is

released and before upon the bottom thereof. The housing is,

preferably provided with a removable closure 39, and an elastic element 40, such as a coil spring is arranged within the housing with one end thereof resting against the shoulder 36,'of the element 29, and the other end engaging the closure 39. The normal tendency of the spring 40, is to maintain the shoulder 36, of the element 29, against the bottom of the housing and interposed between the bottom of the housing, on the outside thereof and the top of the beam or element 18, is another elastic element 41, preferably in the form-of a coil spring which encompasses the element 29, with one of its ends en aging and resting against the bottom of t e housing and the other end engaging and resting against the top of the beam or element 18. It will thus be seen that the housing 37, 'is supported by the elastic element 41, for movement with the element 29, and the element 29, and the housing 37, are also adapted for movement one with relation to the other, in a manner to be hereinafter described.

Carried by any suitable fixed support, preferably the bolster 10, and within the path of movement of the housing 37 is an adjustably mounted stop device or bolt 42,

37, with respect to the movement of the beam or element18.

In operation, and assuming that the parts are in the position shown in Figure. 1, and

the work 16, is in place upon the (hell, the

cam 25, will be moved out of contact with the portion 33, of the bars or rods 32', and the cushion beam or element 18 will be in its uppermost position with the closure 39, of the housing 37, in contact with the end of the stop device 42, with the spring or elastic members 10-A1 placed under compression.

When the press is operated the draw ring cage 14, will be lowered, causing the draw or gripping ring 15, to move into contact with the work 16, to grip the same upon the die 11.; Inasmuch as the cushion beam or element 18, is unlocked from the cage 14, the

latter will move independently of the former die and through the medium of the pins 23,

the cushion beam or element 18, will be lowere'd against the pressure of the fluid in the cylinders 20. This lowering movement of the beam or element 18,-will operate first to permit the elastic elements 4041 to expand or exert their stress upon the element 29, in

such a manner as to shift the element 29, with respect to the beam or element 18, in a direction to rotate the cam 25, about its pivot and thereby cause the active edge thereof to' frictionally grip the surface of the portion 33, of the bar or rod 32, and therebylockthe cage 14, for movement with the element 18. As the two elements are thus locked together and as the beam or element 18, continues in its lovfiring movement the closure 39, of the housing 37, will move away from the stop device 42, and further as the beam or element 18, is lowered it will be cushioned in its lowering movement by means of the compression of the fluid in the cylinders 20. v

. The parts will then be in the position shown in Figures 2 and 7, and will remain in this position unjtil after the forming operation and until the punch 17, is withdrawn from the work. :When the cage 14, is raised it will, inasmuch as it 'is locked with the beam or element 18, rise withthe latter and the two will be locked together until the closure 39, of the housing 37, abuts the end of the stop 42, and this will occur slightly before the beam or element 18,

reaches the limit of its upwardmovement- A further movement of the beamorelement 18, in the-same direction, will cause the housing 37 to be arrested in its movement by reason of its engagement with the stop 42, but the element 18, will travel further 1 for a short distance in the same direction. This will causea compression to be exerted upon the springs or elastic elements 40'41 and the spring 41, will then be rendered ineffective with the result that through the medium of the spring'or elastic element 40, and the housing 37, the element 29, assumes such relative positions that after the cam 25, is started 1n its rocking movement, the spring 40, will then shift the element 29, with respect to the beam or element 18, to

- further rotate the cam device 25, from its ently of the latter.

locking position shown in Figure 7 to the position shown in Figure 8, thereby unlocking the cage 14, and the beam or element 18, to permit the former to move independ- The movement of the portion 33, of the bar or rod '32, with respect to the beam or element 18, will start the rocking of the cam 25, about its pivot into an inoperative position and the expansion of the spring element 40, whenthe parts are thus released, will continue the rocking movement of the cam 25, until it assumes the position shown in Figure 8.

unlocked with respect to the draw ring cage 14, to permit the latter to move with the former and also independently with respect thereto and this automatic locking and unlocking is effected at predetermined points in the travel or movement of the draw ring cage 14,'and also of the beam or element 18.

When it is desired to change or adjust the die upon the bed or bolster 10, unless some means is provided for locking the beam or element 18, the latter will drop to its lowermost position thereby causing considerable inconvenience and annoyance. In order therefore to maintain this element or beam 18, in its raised or uppermost position, when it is unlocked from the cage 14, or when the beam or element 18 assumes the position shown in Figures 1 and 8, there is provided a locking device which will maintain the cam 25, in its ineffective position with respect to the bar or rod 32. Any suitable locking device may be-provided for this purpose but a simple and efficient lock .embodies a bar or rod 43, which is preferably carried by the beam or element 18, and extends upwardly therefrom to project through and move in an opening 44, in the bolster 10. This bar or rod 43, is connected to the beam or element 18, for axial rotation in any suitable manner such asby means of collars 45+46. A lug or projection 47, is connected with the bar or rod 43, and the up per extremity of the bar is preferably provided with an angular portion 48, for the reception of a tool or implement by means of which the bar or rod 43, may be rotated with respect to the element 18, to shift the ug or projection 47.

The housing 37, is provided with a laterally projecting portion 49, having a bifurcation 50, in one of its edges to'form spaced shoulders. This bifurcation 50, receives the bar or rod 43, and the latter serves as a guide for maintaining the housing 37, against rotation with respect to the element 29. This locking device is normally maintained ineffective but when it is desired to lock the parts in the position shown in Figure 8, the lug or shoulder 47, will stand above the projection 49, on the housing and by rotating the rod 43, this projection 47, may be positioned to extend across and 'rest upon the projection 49, as shown more clearly in Figure 6. When it is desired to unlock the parts this rod is rotated so as to move the projection 47, so that it will pass through the bifurcation 50.

' The upper surface of one of the ears forming the bifurcation 50, of the projection 49 may, if desired be provided with an inclined surface 51. and the lower surface of the lug or projection 47, may also be provided with an inclined surface 52, so as to assist in the manipulation of the rod 43, the upper surface of the other ear of the bifurcated portion being preferably flat as at 53,. to form a stop shoulder 54, to limit the rotation of the rod 43, in one direction.

Throughout the specification and claims, the. locking device 25, has been designated as a cam, but it is to be understood that any kind of a locking element other than cam, and which is suitable for the purpose may be employed, and therefore the term cam as herein used is not to be construed as a term of limitation.

While the preferred form of the invention has been herein shown and described it is to be understood that various changes may be made in the details of construction and in the combination and arrangement of the several parts, within the scope of the claims, without departing-from the spirit of this invention.

What is claimed as new is 1. In combination, a die press embodylng co-operating shaping members, means for holding the material while being shaped, the said means embodying a holding element and amovable element for actuating the said holding element, a cushion element operating upon one of the said shaping members, fluid pressure means operating upon the said cushion element, means for automatically locking together the said holding element and the said cushion element whereby they will be caused to move together, and means for automatically unlocking themso that the said holding element may be moved independently of the said cushion element.

2. In combination, a die press embodying co-operating shaping members, means for holding the material while being shaped, the said means embodying a holding element and a movable element for actuating the said holding element, a cushion element operating upon one of the said shaping members, fluid pressure means operating, upon the said cushion element, means for automatically locking together the said holding element andthe said cushion element whereby they will be caused to move together, and means controlled by the movement of the said cushion element for automatically unlocking the said cushion element and the said holding element so that the holding element may be moved independently of the said cushion element.

3. In combination, a die press embodying c'o-operating shaping means, means for holding the materialwhile being shaped, the said means embodying a holding element and a movable element for actuating the holding element, a cushion element operating upon a portion of the shaping means, fluid pressure means operating upon the said cushion element, means embodying a shiftable cam element for automatically locking together the said holding element and the said cushion element whereby they will :move together, teeth on said cam, a shiftable toothed element for actuating the cam, means operating automatically'to shift the said toothed element in one direction to render the cam active, and means for shifting the said toothed element in the opposite direction to render the cam ineifective.

' 4. In combination, a die press embodying co-operating shaping means, means holding the material while being shaped, the said means embodying a holding element and a movable element for actuating the holding element, a cushion element operating upon a portion of the shaping means, fluid pressure means operating upon the said cushion element, means embodying a shiftable cam element for automatically locking together the said holding element and the said cushion element whereby they will move together, teeth on said cam, a shiftable toothedelement for actuating the cam, means operating automatically to shift the said toothed element in one direction to render the cam active, and means adapted to automatically shift the said toothed element in the oppositedirection at a predetermined point in the movement of the said cushion element to render the said cam ineffective. p

-5. In combination, a die press embodying co-operating shaping means, means for bolding the material while being shaped, the said means embodying a holding element and a movement element foractuating the holding element, a cushion element operating upon a portion of the shaping means, fluid pressure means operating upon the said cushion element, means embodying a shiftable cam element for automatically locking together the said holding element and the said cushion element whereby they will move together, teeth on said cam, a shiftable toothed element for 'actuating the cam, means operating automatically to shift the said toothed element in one direction to render the cam active,

means for shifting the said toothed element in the opposite direction to render the cam ineifective, and additional means for locking the said toothed element in one of its shifted positions.

6. Locking device for pressure element for double acting power press and embodying a pressure element, fluid controlled means acting thereupon, a reciprocable element, means operating automatically to lock the said elements together to cause them to move together, and means for automatically unlocking them so that the said reciprocable element may be moved independently said pressure element.

7. Locking device for pressure element for double acting power press and embodying a for of the pressure element, fluid controlled means acting thereupon, a reciprocable. element, means operating automatically to lock the said elements together to cause them to move together, and means for automatically unlocking them so that the-said reciprocable element, means operating automatically to lockthe said elements together to cause them to 'move together, means for automatically unlocking them so that the said reciprocable element maybe moved independently of the said pressure element, both of the said means embodying a cam, teeth on the cam, a. shiftable toothed element for moving the cam, a plurality of means automatically rendered active at different points in the movement of the pressure element for shifting the said toothed element, and positive means for locking the said toothed element in one of the positions into which it has been shifted.

9. A locking device for pressure element for a double acting power press and embodying a pressure element, fluid controlled means acting thereupon, a reciprocable element, means embodying a cam for locking the said elements together, a shiftable element for actuating the said cam to render the same effective and ineffective, and opposed elastic means operable upon the said toothed element for controlling its direction of movement, the said elastic means being respectively rendered active at different predeterminedpoints in the movement of the said pressure element.

10. A locking device of the character described embodying two elements reciprocable one with relation to the other, fluid pressure means operatilng upon one of the elements, atoothed cam device carried by one of the elements and adapted to co-operate with the other element for locking the said elements for movement together, a shiftable toothed element carried by one of the first said elements for actuating the cam, opposed spring elements operable upon the said toothed element for moving it in opposite directions to render the cam effective and ineffective, and means for rendering one of the said spring elements effective and the other of the said spring elements ineffective at a predetermined point in the movement 66 of one of the first recited elements.

11. A locking device of the character described embodying two elements reciprocable one with relation to the other, fluid. pressure means operating upon one of theelements, a toothed cam device carried by one of the elements and adapted to co-operate with the other element for locking the said elements for movement together, a shiftable toothed element carried by one of the first said elements for actuating the cam, opposed spring elements operable upon the said toothed element for moving it in opposite directions to render the cam effective and ineffective, and means for rendering one of the said spring elements effective and the other of the said spring elements inefl'ectoothed element with the one of the first elements by which it is carried.

12. A locking device of the character described embodying two elements reciprocable one with relation to the other, fluid pressure means operating upon one of the elements, a toothed cam device carried by one of the elements and adapted to co-operate with the other element for locking the said elements for movement together, a shiftabletoothed element carried by one of the first said elements for actuating the cam, a shoulder on the toothed element, a member slidable upon the toothed element on one side of the shoulder, an elastic member operating upon the said member and tending normally to move the member against said shoulder to shift the toothed element in one direction, a portion of the said member extending to the other side of and being spaced from said shoulder, an elastic element disposed between the said portion and the said shoulder and adapted to be rendered effective for shifting said toothed element, and means for shifting the said member with relation to the toothed element for rendering one of the said elastic elements effective and the other elastic element ineffective.

13. A locking device of the character described embodying two elements reciproca-ble one with relation to the other, fluid pressure means operating upon one of the elements, a toothed cam device carried by one of the elements and adapted to co-operate with the other element for locking the said elements for movement together, a shiftable toothedelement carried by'one of the first said elements for actuating the cam, a shoulder on the toothed element, a member slidable upon the toothed element on one side of the shoulder, an elastic member 0 erating upon the said member and ten ing normally to move the member against said shoulder to shift the toothed element in one direction, a portion of the said member extending to the other side of and being spaced from said shoulder. an elastic element disposed between the said portion and the said shoulderand adapted to be rendered effective for shifting said toothed element, and a fixed stop arranged in the path of movement of the said member with the one of the first recited elements which supports the said member for shifting the said member with MARTIN BALCKER. 

